Boston (BOS) to San Francisco (SFO) business class award flights

SFO → BOS

Lowest seen in the last 2 daysPlus fees$25.60Program

Atmos RewardsAirline

American AirlinesDepartingFri, Oct 23

Last checked 1d agoChecked 21 Oct 2026, 01:50 UTC

Which program and airline costs you least

Boston to San Francisco in business class starts at 35K Atmos points plus $25.60 — American Airlines through Atmos Rewards. Delta Air Lines through Delta SkyMiles charges the least cash — $5.60 — but wants 62.6K miles.

Every way to book BOS to SFO with miles or points
Airline	Program
United Airlinesvia IADlast seen 9 Oct, not re-checked sinceLifeMiles	LifeMiles	27Kplus $5.60	$5.60
United Airlinesvia IADlast seen 11 Oct, not re-checked sinceUnited MileagePlus	United MileagePlus	30Kplus $5.60	$5.60
American Airlinesvia JFKAtmos Rewards	Atmos Rewards	Fewest points35K Atmos pointsplus $25.60	$25.60
Delta Air LinesNonstopDelta SkyMiles	Delta SkyMiles	62.6Kplus $5.60	Lowest fees$5.60
JetBlueNonstoplast seen 11 Oct, not re-checked sinceUnited MileagePlus	United MileagePlus	100Kplus $5.60	$5.60

Where the space is over the next 60 days

Dashed days are prices last seen more than 3 days ago and not re-checked since.

BOS to SFO in business class: the facts

Over the next 60 days we hold business class seats from Boston to San Francisco on 42 of the 60 departure days, through 4 programs. These figures are counted from the seats stored for those dates, not from a price history; the typical day is the median of each day's cheapest seat. Data updated October 21, 2026.

LifeMiles
Days with space
4 of 60
Lowest
27,000 miles
Typical day
27,000 miles
Cash on top
$6 to $58
United MileagePlus
Days with space
42 of 60
Lowest
30,000 miles
Typical day
73,800 miles
Cash on top
$6
Atmos Rewards
Days with space
23 of 60
Lowest
35,000 Atmos points
Typical day
35,000 Atmos points
Cash on top
$26 to $31
Delta SkyMiles
Days with space
42 of 60
Lowest
62,600 miles
Typical day
68,600 miles
Cash on top
$6

BOS to SFO business class seats per program over the next 60 days
Program	Days with space	Lowest	Typical day	Cash on top
LifeMiles	4 of 60	27,000 miles	27,000 miles	$6 to $58
United MileagePlus	42 of 60	30,000 miles	73,800 miles	$6
Atmos Rewards	23 of 60	35,000 Atmos points	35,000 Atmos points	$26 to $31
Delta SkyMiles	42 of 60	62,600 miles	68,600 miles	$6

Nonstop or with a connection

Nonstop seats on Delta Air Lines, JetBlue and United Airlines. With a connection on American Airlines.

How to book it

LifeMiles books on lifemiles.com: sign in there, search BOS to SFO in business class on a date with space, and pay in miles with the cash on top (from $6).
United MileagePlus books on united.com: sign in there, search BOS to SFO in business class on a date with space, and pay in miles with the cash on top (from $6).
Atmos Rewards books on alaskaair.com: sign in there, search BOS to SFO in business class on a date with space, and pay in Atmos points with the cash on top (from $26).
Delta SkyMiles books on delta.com: sign in there, search BOS to SFO in business class on a date with space, and pay in miles with the cash on top (from $6).

MilesZone finds the seat; it does not book it or take payment.

More routes

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Every route we watch from Boston (BOS)

Get told the moment a BOS → SFO seat opens.

We re-check that exact seat seconds before the email leaves, so what you open is still there.

Email only. Searching this route stays free for departures in the next 60 days.